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// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "media/midi/midi_service.h"
#include "base/feature_list.h"
#include "base/memory/ptr_util.h"
#include "base/strings/stringprintf.h"
#include "media/midi/midi_manager.h"
#include "media/midi/midi_switches.h"
namespace midi {
namespace {
bool IsDynamicInstantiationEnabled() {
// TODO(toyoshim): Support on all platforms. See https://crbug.com/672793.
#if defined(OS_LINUX) || defined(OS_WIN)
return true;
#else
return base::FeatureList::IsEnabled(
features::kMidiManagerDynamicInstantiation);
#endif
}
} // namespace
MidiService::MidiService(void)
: is_dynamic_instantiation_enabled_(IsDynamicInstantiationEnabled()),
active_clients_(0u) {
base::AutoLock lock(lock_);
if (!is_dynamic_instantiation_enabled_)
manager_ = base::WrapUnique(MidiManager::Create(this));
}
MidiService::MidiService(std::unique_ptr<MidiManager> manager)
: is_dynamic_instantiation_enabled_(false), active_clients_(0u) {
base::AutoLock lock(lock_);
manager_ = std::move(manager);
}
MidiService::~MidiService() {
base::AutoLock lock(lock_);
manager_.reset();
base::AutoLock threads_lock(threads_lock_);
threads_.clear();
}
void MidiService::Shutdown() {
base::AutoLock lock(lock_);
if (manager_.get())
manager_->Shutdown();
}
void MidiService::StartSession(MidiManagerClient* client) {
base::AutoLock lock(lock_);
if (!manager_.get()) {
CHECK(is_dynamic_instantiation_enabled_);
CHECK_EQ(0u, active_clients_);
manager_.reset(MidiManager::Create(this));
}
active_clients_++;
manager_->StartSession(client);
}
void MidiService::EndSession(MidiManagerClient* client) {
base::AutoLock lock(lock_);
CHECK(manager_.get());
CHECK_NE(0u, active_clients_);
manager_->EndSession(client);
active_clients_--;
if (is_dynamic_instantiation_enabled_ && !active_clients_) {
// MidiManager for each platform should be able to shutdown correctly even
// if following Shutdown() call happens in the middle of
// StartInitialization() to support the dynamic instantiation feature.
manager_->Shutdown();
manager_.reset();
}
}
void MidiService::DispatchSendMidiData(MidiManagerClient* client,
uint32_t port_index,
const std::vector<uint8_t>& data,
double timestamp) {
base::AutoLock lock(lock_);
manager_->DispatchSendMidiData(client, port_index, data, timestamp);
}
scoped_refptr<base::SingleThreadTaskRunner> MidiService::GetTaskRunner(
size_t runner_id) {
base::AutoLock lock(threads_lock_);
if (threads_.size() <= runner_id)
threads_.resize(runner_id + 1);
if (!threads_[runner_id].get()) {
threads_[runner_id] = base::MakeUnique<base::Thread>(
base::StringPrintf("MidiServiceThread(%zu)", runner_id));
#if defined(OS_WIN)
threads_[runner_id]->init_com_with_mta(true);
#endif
threads_[runner_id]->Start();
}
return threads_[runner_id]->task_runner();
}
} // namespace midi
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